CODEWITHSUNDEEP
androidandroid-activityback-stack
dhun
dhun

Reputation: 643

Android: Clear all backstack activities and then finish current activity

I have various activities in my app and the flow is very complex. What I want to do is, as soon as usb device is attached, I want to clear and finish the back stack activities, then finish the current activity and the System.exit(0) to close the app.

I have already implemented usb device listener. I want to know how do I clear and finish back stack activities(if there are any, it is not going to have any backstack activities everytime) and then finish the current one.

Also, If my activity A is on Top and it has 2 activities (B,C) in back stack. Now if activity A is running in the background and usb connected, only Activity A will listen to it right? (I have usb receiver implemented in every activity.)

How do I achieve this without my app crash?

Thanks

Upvotes: 6

Views: 3788

Answers (2)

Sai Phani
Sai Phani

Reputation: 462

there is finishAffinity() method that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher

Source

finishAffinity() will Finish this activity as well as all activities immediately below it in the current task that have the same affinity

If you want for all API levels
in one of your activities

Intent intent = new Intent(this, YourActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // this will clear all the stack
intent.putExtra("Exit me", true);
startActivity(intent);
finish();

Then in YourActivity onCreate() method add this to finish the Activity

setContentView(R.layout.your_layout);
if( getIntent().getBooleanExtra("Exit me", false)){
   finish();
   return; // add this to prevent from doing unnecessary stuffs
}

Upvotes: 7

matty357
matty357

Reputation: 637

In an app I made, I have put:

if(Globals.isExit){
  finish();
}

In every onResume() method in every activity.

Globals is a class that is declared as an in the manifest.xml. The Global class has a boolean called exit.

In all activities option menu, include an exit option thats sets Globals.exit to true, and calls finish()

Then any activities left unfinished are all finished.

Not sure if you would need to use an intent to clear the backstack or if finishing clears it for you. Sorry if im wrong on that bit.

Sorry for any bad typing, I'm on a phone.

Upvotes: -1

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